Notes: ‘Dreadnought’ No.20 was built in 1912 as a 12 ton bogie stone wagon utilising de-motored 1893/94 Milnes S3 trucks, entering service in March of the same year. It saw regular use until withdrawl in 1933 as life expired.

No.20 saw a reprieve in 1941, being rebuilt using new timber, and working until 1944, being officially written off post-war in 1952. It was broken up in 1957 after a long storage period at Dhoon Quarry.